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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4255485e2cd8ff9cc85b259c6617a91230069966bd86eb527c2dea0a2c1752' 
  AND token = 'TBH6hOFIoGvtPTNzYsIHRAHXwtfx6hLBpfQSSXtL04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}